Agent Orange—or Herbicide Orange (HO)—is one of the herbicides and defoliants used by the U.S. military as part of its herbicidal warfare program, Operation Ranch Hand, during the Vietnam War from 1961 to 1971. It was a mixture of equal parts of two herbicides, 2,4,5-T and 2,4-D. Following the conclusion of the War in Southeast Asia, contention over the Agent Orange topic has not subsided. Two primary threads of the controversy now relate to toxicity of the agent or potential long-term health effects and to additional potential exposure locations outside of the war-zone.

Agent Orange—or Herbicide Orange (HO)—is one of the herbicides and defoliants used by the U.S. military as part of its herbicidal warfare program, Operation Ranch Hand, during the Vietnam War from 1961 to 1971. It was a mixture of equal parts of two herbicides, 2,4,5-T and 2,4-D. Following the conclusion of the War in Southeast Asia, contention over the Agent Orange topic has not subsided. Two primary threads of the controversy now relate to toxicity of the agent or potential long-term health effects and to additional potential exposure locations outside of the war-zone.